Shuttle check controlled by temperature



'APYi'12,1945-. I R.-G. TURNER 2,397,821

SHUTTLE CBECK CONTROLLED BY TEMPERATURE Fild Dec. 15, 1944 Patented Apr. 2, 1946 a I 7 2,397,821

UNITED STATES PATENT orrlcs SHUTTLE CHECK CONTROLLED BY TEMPERATURE Richard G. Turner, Worcester, Mass, assignor to Crompton & Knowles Loom Works, Worcester, Mass., a corporation of Massachusetts Application December 15, 1944, serial No. 568,305

12 Claims. (01. 139-185 This invention relates to improvement in The matter thus far described is of common shuttle checks for looms and it is the general construction and of itself forms no part of my object of the invention to provide shuttle checkpresent invention. 7 ing mechanism the checking effect of which In carrying my presentinventioninto effect I varies with temperature changes thereof. provide shuttle checking mean which exerts a After a loom has stood idle overnight several varying checking force on the shuttle depending minutes of operation are required to establish upon the temperature of the checking means. proper running condition due principally to the As set forth herein the invention is applied to a fact that the parts of the shuttle box which enshuttle binder, but I do not wish necessarily to gage the shuttle are cold and have the effect be limited to this means of carrying my invenof causing the binder or other checking agent to tion into effect. exert too great a force on the shuttle. The lat- Referring to Figs. 2 and 3 it will be seen that ter is therefore not able to enter the shuttle box the binder B is pivoted on pin 2| and has the left to a sufficient depth for correct picking and the endthereof received by a guide 23 forming part protector mechanism operates to stop the loom. 5 of thebox mouth 24. The binder i made of two After a short period of this unsatisfactory opstrips of metal having different coefficients of oration. the shuttle box temperature is raised sufexpansion, the outer or front strip 25 having a ficiently so that thereafter the shuttle runs relatively low coefiicient while the inner or rear.

smoothly and. does not interrupt operation. strip 26 has a higher coefiicient. These two It is an important object of my present invenstrips may be secured together in any approved tion to provide a shuttle checking mechanism manner as by brazing so that heat will be transwhich is responsive to changes in temperature mitted readily from one strip to the other and and which acts in such a way as to offer a rethe two strips in effect will form a single inteduced Or subnormal checking forceto the shuttle gratedbinder. In practice I have made the strip when cold and offer a higher or normal checking 5 of steel and the strip 26 of brass and have seresistance whenwarm. As set forth hereinafter cured the two parts together by means of silver I accomplish these results by making the shuttle solder. binder of two different metals having different When the loom is started up after a considercoeflicients of expansion and wherein the metals able period of inactivity both the strips 25 and are related so that as the binder temperature 30 26 will be cold and the binder a a whole will be rises it will be bent or curved towardthe shuttle. of such form that there is a maximum distance With these and other objects in view which between the box back 20 and the shuttle checkwill appear as the description proceeds, my ining surface 21 of the binder. Under these convention resides in the combination and arrangeditions the binder will have a form suggested by ment of parts hereinafter described and set forth. the full lines in Fig. 3 and offers a minimum of In the accompanying drawing, wherein a conresistance to the shuttle, a condition which is venient embodiment of my invention is set forth, favorable to the picking of a cold shuttle. As Fig. 1 is a front elevation of one end of a loom picking continues the frictional engagement of having a binder made according to my present the shuttle with the surface 27 heats up both invention, of the strips 25 and 26 and the latter strip ex- Fig. 2 is an enlarged plan view looking in the pands slightly more than does the steel strip with direction of arrow 2, and the result that the contour of the binder is Fig. 3 is an enlarged plan view of the binder changed and surface 2l moves rearwarclly toward shown in Fig. 2 showing" how its contour is the wall 20 as indicated in dotted lines, Fig. 3. changed by alteration of its temperature. Under these conditions the binder offers a higher Referring particularly to Fig. 1, I have shown resistance to checking of the shuttle, but by this a loom frame I0 having a lay llwith a shuttle time the shuttle has become suihciently warm so box l2 at the right end thereof. A picker stick that it is adjusted to the greater checking force 13 is provided with a picker I4 for picking the of. the shuttle binder. The aforesaid higher shuttle S out of box I2, and picking mechanism checking resistance will in fact be the normal designated generally at 15 is connected to the resistanoeof ordinary operations, while the lower stick in usual manner as at [6. The shuttle box resistance offered when the binder is cold will be I2 may have a box back 20 fixed to the lay as subnormal. suggested in Fig. 2 and has a binder pivot or pin 7 In some cases it may be desirable to provide 2|. and the usual binder spring 22. thebrass strip 26 with a protective coating to.

prevent discoloration of the front wall of the shuttle. For this purpose I have sprayed the rear surface of the strip 26 with stainless steel,

after which the sprayed surface is polished. The

spraying leaves only a thin layer of metal on the brass strip which has little or no effect in counteracting the tendency of strip 26 to expand as the temperature thereof rises. 7

While I have described the binder as being made of strips of steel and brass, yet I do not wish necessarily to be limited to this combination of" metals, inasmuch as it is sufficient for the purposes of my invention if the binder is so cons L able that the one havingithehigher coeflicient of expansion is placed nearest to the shuttle so that as the temperature of the composite binder rises its shuttle checking. surface wilt be bowed rearwardly to increase the shuttle checking effect.

From the foregoing itwilllbe seen that I have provided a shuttle checkingmechanism 'for a loom so constructed asgto be responsive to temperature changes in such a way that as the temperature rises the shuttle checking resistance is increased.

Having thus described: my invention itwill be seen that changes: and modifications may-bema'de the y those skilled in the art without'departingfrom the spirit and scope'of the invention and I do not wish to be limited tothe details herein disclosed, but wh'atI claimi'si 1. In a loom having a lay'provided with a shuttle box into and from which a shuttle is picked, shuttle checking means forming part of the shuttle box and formed of-two metallic parts extending along and secured to each other and" having different OOefflGientS *of expansion; said checking means being positioned for frictional engagement with the'shuttle so that the temerature of said metallic parts rises with continued operation of the shutt1e,-saidchecking the lay and extending along the other side of the box, said binder having a shuttle engaging surface bowed toward the wall, and said binder being made of two metallic parts secured to each other and having diiierent coeificients of expansion, said parts being so related that as the temperature thereof increases said surface moves toward'said Wall. 1

5. In a loom having a layprovided with a shuttle box, a box forming wall extending along one side of the shuttle box, and a binder pivoted to the lay and extending along the other side of the -shuttle box and having a shuttle engaging surface bowed toward said wall, said, binder being formed of two pieces of metal having different coefficients of expansion which operate upon a rise of temperature of the binder to move said I surface toward said-Wall.

means beingsoflconstructed' that as thetempera v ture thereof rises thechechingefiect'thereof on the shuttiei'sincreasedfi In a loomhaving a shuttlebox into and from which a shuttle-is picked, a shuttlecheckingmember forming part of--theshuttle boxandcom structed of two metallic parts secured to-each other and having different fcoefiicients ofiexparr sion, said memberbeingpositioned forengagement with the shuttle'and eifectiveias lthetemperature thereof rises due .to frictional engaged inentwith the shuttle to increase the checking thereof on the shuttle. 3. In a thermally controlled. shuttle checking mechanism for a loom having a shuttle box-intoand from which a. shuttle is -picked, a member" 16..A thermally controlled shuttle checking mechanism for a loom including a shuttle engaging member made of two parts having different coefficients of expansiona'nd so constructed" as to exert. a subnormal checking force on the shuttle when the temperature of the mechanism is subnormal and. exert 'normal checking force on the. shuttle when normal operating temperature ofthe mechanism is attained.

'Z'. A thermally controlled-shuttle checking.

8.: A loom shuttle-binder having a shuttle en-r gaging surface and formed of two members having different coeificients of expansion, said members being so rel'atedth'at the contour of the shuttle engaging" surface of v the binder is altered as the. temperature of said members increases.

9; A loom shuttle binder having a shuttle engaging surface between the ends thereof and formed of two members having different coefficients of expansion; said membersbeing's' related that said surface-moves away from a line joining the ends of the binder as the temperature ofsaid members increases.

10. In a loom having a shuttle b'ox, a binder forming part of the shuttle box and including a strip of metal having "a relatively low ccefi'icient of expansion on the'outer side of the binder facing away from the shuttle box and including a second strip of metal secured tothe first strip and havinga relatively high coefficient of expansion and loca'tedonthev inner side of the binder facing toward'said' shuttle box.

11. In a loom having a shuttle box, a binder formin part of the shuttle box and including a strip oft steel located on the side of the binder facing away from the shuttle box and said binder including also a strip of brass secured to the first strip and located-on the side of the binder facing toward the shuttle box, 7 I

12. In a loom having a shuttle box, a binder forming part of the shuttle box and including a strip of metal having-a relatively low coefiicient of expansion located on the side of the "binder facing away from the shuttle box and said binder including also'a strip of metal having a, relatively high coefficient of'expansion secured to'thev first strip and located On the-sideof the binder facing toward the shuttle check, 1 5 :1 j g j 1 RICHARD G. TURNER. 

